swapon

Enable devices and files for swapping. Note: path/to/file can either point to a regular file or a swap partition. More information: https://manned.org/swapon.

• Show swap information:
  swapon
• Enable a given swap area:
  swapon {{path/to/file}}
• Enable all swap areas specified in /etc/fstab except those with the noauto option:
  swapon --all
• Enable a swap partition by its label:
  swapon -L {{label}}